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18 supernovae candidates detected by the OGLE-IV survey

ATel #4495; L. Wyrzykowski, A. Udalski, S. Kozlowski (Warsaw University Astronomical Observatory, Poland), on behalf of the OGLE team
on 17 Oct 2012; 21:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lukasz Wyrzykowski (wyrzykow@ast.cam.ac.uk)

Subjects: Optical, Supernovae, Transient

We are pleased to announce a regular search for transients by the OGLE-IV wide field survey (http://ogle.astrouw.edu.pl). OGLE-IV has been conducted since March 2010 at the Las Campanas Observatory, Chile. The 1.3 m Warsaw Telescope equipped with a 32 CCD mosaic camera covering 1.4 square degrees on the sky with the resolution of 0.26 arcsec/pixel has been used. The limiting magnitude of the search is I~21.5 mag. Currently the regular search for transient phenomena covers about 400 square degrees towards the Magellanic System (Clouds and Bridge) and the Galactic bulge. The typical cadence of the survey is one observation per 2 or 3 nights. The transients will be searched in the OGLE photometric databases with variety techniques. Currently we provide results from the search of the databases of new objects, i.e., objects not present on the OGLE standard reference images. Difference image technique is applied for photometry and transient detection and the reductions are performed almost in the real time.

Here we report on the discovery of 18 on-going supernova candidates found in the OGLE fields around the Magellanic Clouds and Magellanic Bridge. Most of the candidates are located next or on apparent galaxies, indicating they are very likely supernovae. Presented here objects include only the SN candidates detected in the first weeks of the 2012/2013 season. Hundreds SNe have been detected in the previous observing seasons data (Kozlowski et al., in preparation).

The list of SN candidates is provided below with Ra,Dec (J2000.0) and maximum I-band magnitude:
OGLE-2012-SN-006 3:33:34.79 -74:23:40.1 17.62
OGLE-2012-SN-007 3:01:13.44 -75:01:16.1 18.42
OGLE-2012-SN-008 4:33:37.01 -71:32:20.4 18.55
OGLE-2012-SN-009 0:13:56.46 -70:01:41.3 14.89 also known as 2012dk
OGLE-2012-SN-010 2:58:26.16 -72:45:12.0 18.23
OGLE-2012-SN-011 2:08:45.14 -70:39:00.7 18.52
OGLE-2012-SN-012 4:36:17.61 -73:09:21.9 18.66
OGLE-2012-SN-013 5:42:48.70 -71:35:52.5 18.82
OGLE-2012-SN-014 4:37:19.18 -69:08:25.2 18.20
OGLE-2012-SN-015 4:33:19.02 -65:07:56.1 19.05
OGLE-2012-SN-016 5:58:56.36 -68:02:54.9 19.18
OGLE-2012-SN-017 3:09:20.61 -73:00:02.6 19.13
OGLE-2012-SN-018 0:53:37.61 -70:04:01.0 19.13
OGLE-2012-SN-019 3:09:51.27 -72:15:24.6 19.26
OGLE-2012-SN-020 0:27:08.75 -74:14:08.2 18.50
OGLE-2012-SN-021 3:21:03.26 -70:51:13.8 19.18
OGLE-2012-SN-022 3:22:32.00 -74:16:34.6 19.76
OGLE-2012-SN-023 5:40:58.11 -68:35:09.5 19.79

Photometric and spectroscopic follow-up is strongly encouraged.

Finding charts and light curves are available here.